1 /* 2 * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved. 3 * Copyright (C) 2009 Google Inc. All Rights Reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #include "config.h" 29 #include "core/workers/Worker.h" 30 31 #include "bindings/core/v8/ExceptionState.h" 32 #include "core/dom/Document.h" 33 #include "core/events/MessageEvent.h" 34 #include "core/fetch/ResourceFetcher.h" 35 #include "core/inspector/InspectorInstrumentation.h" 36 #include "core/frame/LocalDOMWindow.h" 37 #include "core/frame/UseCounter.h" 38 #include "core/workers/WorkerGlobalScopeProxy.h" 39 #include "core/workers/WorkerGlobalScopeProxyProvider.h" 40 #include "core/workers/WorkerScriptLoader.h" 41 #include "core/workers/WorkerThread.h" 42 #include "wtf/MainThread.h" 43 44 namespace blink { 45 46 inline Worker::Worker(ExecutionContext* context) 47 : AbstractWorker(context) 48 , m_contextProxy(0) 49 { 50 } 51 52 PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState) 53 { 54 ASSERT(isMainThread()); 55 Document* document = toDocument(context); 56 UseCounter::count(context, UseCounter::WorkerStart); 57 if (!document->page()) { 58 exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid."); 59 return nullptr; 60 } 61 WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page()); 62 ASSERT(proxyProvider); 63 64 RefPtrWillBeRawPtr<Worker> worker = adoptRefWillBeNoop(new Worker(context)); 65 66 worker->suspendIfNeeded(); 67 68 KURL scriptURL = worker->resolveURL(url, exceptionState); 69 if (scriptURL.isEmpty()) 70 return nullptr; 71 72 worker->m_scriptLoader = WorkerScriptLoader::create(); 73 worker->m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, worker.get()); 74 worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get()); 75 return worker.release(); 76 } 77 78 Worker::~Worker() 79 { 80 ASSERT(isMainThread()); 81 if (!m_contextProxy) 82 return; 83 ASSERT(executionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists. 84 m_contextProxy->workerObjectDestroyed(); 85 } 86 87 const AtomicString& Worker::interfaceName() const 88 { 89 return EventTargetNames::Worker; 90 } 91 92 void Worker::postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState) 93 { 94 ASSERT(m_contextProxy); 95 // Disentangle the port in preparation for sending it to the remote context. 96 OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState); 97 if (exceptionState.hadException()) 98 return; 99 m_contextProxy->postMessageToWorkerGlobalScope(message, channels.release()); 100 } 101 102 void Worker::terminate() 103 { 104 if (m_contextProxy) 105 m_contextProxy->terminateWorkerGlobalScope(); 106 } 107 108 void Worker::stop() 109 { 110 terminate(); 111 } 112 113 bool Worker::hasPendingActivity() const 114 { 115 // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners. 116 return (m_contextProxy && m_contextProxy->hasPendingActivity()) || m_scriptLoader; 117 } 118 119 void Worker::didReceiveResponse(unsigned long identifier, const ResourceResponse&) 120 { 121 InspectorInstrumentation::didReceiveScriptResponse(executionContext(), identifier); 122 } 123 124 void Worker::notifyFinished() 125 { 126 if (m_scriptLoader->failed()) { 127 dispatchEvent(Event::createCancelable(EventTypeNames::error)); 128 } else { 129 ASSERT(m_contextProxy); 130 WorkerThreadStartMode startMode = DontPauseWorkerGlobalScopeOnStart; 131 if (InspectorInstrumentation::shouldPauseDedicatedWorkerOnStart(executionContext())) 132 startMode = PauseWorkerGlobalScopeOnStart; 133 m_contextProxy->startWorkerGlobalScope(m_scriptLoader->url(), executionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script(), startMode); 134 InspectorInstrumentation::scriptImported(executionContext(), m_scriptLoader->identifier(), m_scriptLoader->script()); 135 } 136 m_scriptLoader = nullptr; 137 } 138 139 void Worker::trace(Visitor* visitor) 140 { 141 AbstractWorker::trace(visitor); 142 } 143 144 } // namespace blink 145